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111. If f(x) and g(x) are defined on domains A, B respectively, then domain of f(x) + g(x) is
A ∪ B
A ∩ B
A Δ B
A - B
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112. The function f : R - {2} → R defined by f(x) = (x2 + 2x)/(x -2) is
one-one and onto
one-one but not onto
neither one-one nor onto
not one one but onto
113. If set S ={x I x is a student in your class} and relation x Ry ↔ x sits in the same row as y, then which of the following statements about R is TRUE?
Reflexive only
Transitive only
Reflexive, transitive and asymmetric
Reflexive, transitive and symmetric
114. If set A has 3 elements and set B has 4 elements, then number of injections that can be deined from A into B is
144
12
24
64
115. Number of bijective functions from set A to itself when A contains 106 elements, is
106
1062
106 !
2106
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